libnsl/rpc/svc_auth_sys.c

	svc_auth_sys.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 *
 * Copyright 2000 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
 * Portions of this source code were derived from Berkeley
 * 4.3 BSD under license from the Regents of the University of
 * California.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * svc_auth_sys.c
 * Handles UNIX flavor authentication parameters on the service side of rpc.
 * There are two svc auth implementations here: AUTH_SYS and AUTH_SHORT.
 * __svcauth_sys does full blown unix style uid, gid+gids auth,
 * __svcauth_short uses a shorthand auth to index into a cache of
 *  longhand auths.
 * Note: the shorthand has been gutted for efficiency.
 *
 */

#ifdef KERNEL
#include <sys/param.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
#include <rpc/auth.h>
#include <rpc/clnt.h>
#include <rpc/rpc_msg.h>
#include <rpc/svc.h>
#include <rpc/auth_sys.h>
#include <rpc/svc_auth.h>
#else
#include <stdio.h>
#include <rpc/rpc.h>
#include <syslog.h>
#endif
#include <sys/types.h>
#include <rpc/trace.h>

/*
 * System (Unix) longhand authenticator
 */
enum auth_stat
__svcauth_sys(rqst, msg)
    register struct svc_req *rqst;
    register struct rpc_msg *msg;
{
    register enum auth_stat stat;
    XDR xdrs;
    register struct authsys_parms *aup;
    register rpc_inline_t *buf;
    struct area {
        struct authsys_parms area_aup;
        char area_machname[MAX_MACHINE_NAME+1];
        gid_t area_gids[NGRPS];
    } *area;
    u_int auth_len;
    u_int str_len, gid_len;
    register int i;

    trace1(TR___svcauth_sys, 0);
    area = (struct area *) rqst->rq_clntcred;
    aup = &area->area_aup;
    aup->aup_machname = area->area_machname;
    aup->aup_gids = area->area_gids;
    auth_len = (u_int)msg->rm_call.cb_cred.oa_length;
    if (auth_len == 0) {
        trace1(TR___svcauth_sys, 1);
        return (AUTH_BADCRED);
    }
    xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,
            XDR_DECODE);
    buf = XDR_INLINE(&xdrs, auth_len);
    if (buf != NULL) {
        aup->aup_time = IXDR_GET_INT32(buf);
        str_len = IXDR_GET_U_INT32(buf);
        if (str_len > MAX_MACHINE_NAME) {
            stat = AUTH_BADCRED;
            goto done;
        }
        (void) memcpy(aup->aup_machname, (caddr_t)buf, str_len);
        aup->aup_machname[str_len] = 0;
        str_len = RNDUP(str_len);
        buf += str_len / (int) sizeof (int32_t);
        aup->aup_uid = IXDR_GET_INT32(buf);
        aup->aup_gid = IXDR_GET_INT32(buf);
        gid_len = IXDR_GET_U_INT32(buf);
        if (gid_len > NGRPS) {
            stat = AUTH_BADCRED;
            goto done;
        }
        aup->aup_len = gid_len;
        for (i = 0; i < gid_len; i++) {
            aup->aup_gids[i] = (gid_t) IXDR_GET_INT32(buf);
        }
        /*
         * five is the smallest unix credentials structure -
         * timestamp, hostname len (0), uid, gid, and gids len (0).
         */
        if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) {
#ifdef  KERNEL
            printf("bad auth_len gid %d str %d auth %d",
                gid_len, str_len, auth_len);
#else
            (void) syslog(LOG_ERR,
                "bad auth_len gid %d str %d auth %d",
                    gid_len, str_len, auth_len);
#endif
            stat = AUTH_BADCRED;
            goto done;
        }
    } else if (! xdr_authsys_parms(&xdrs, aup)) {
        xdrs.x_op = XDR_FREE;
        (void) xdr_authsys_parms(&xdrs, aup);
        stat = AUTH_BADCRED;
        goto done;
    }
    rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
    rqst->rq_xprt->xp_verf.oa_length = 0;
    stat = AUTH_OK;
done:
    XDR_DESTROY(&xdrs);
    trace1(TR___svcauth_sys, 1);
    return (stat);
}

/*
 * Shorthand unix authenticator
 * Looks up longhand in a cache.
 */
/*ARGSUSED*/
enum auth_stat
__svcauth_short(rqst, msg)
    struct svc_req *rqst;
    struct rpc_msg *msg;
{
    trace1(TR___svcauth_short, 0);
    trace1(TR___svcauth_short, 1);
    return (AUTH_REJECTEDCRED);
}

/*
 * Unix longhand authenticator. Will be obsoleted
 */
enum auth_stat
__svcauth_unix(rqst, msg)
    register struct svc_req *rqst;
    register struct rpc_msg *msg;
{
    enum auth_stat dummy;

    trace1(TR___svcauth_unix, 0);
    dummy = __svcauth_sys(rqst, msg);
    trace1(TR___svcauth_unix, 1);
    return (dummy);
}